When do individual option on stocks unfurl for trading? Isn't it 15 minutes AFTER the key indexes embark on?

What is the number of shorts that are permitted to be purchased against a stock?

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Answers:   It is at 9:30 am Eastern time, the same time the exchanges sympathetic.

However, there is an "first night rotation" for the options which can adjournment trading for some options by a few minutes.

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